Extensible pulley



Mar. 3, 1925.

R. GONZALEZ EXTENSIIBLE PULLEY Filed Dec.' 23, 1922 ,v m w u m 1 M n a 1 e 7w m m m 3 5 5 9 Y K, 6 6 8 0 7 3 2 2 5 m I... annua H Q halls Patented Mar... 3, 1925.

PATIENT QFFICE.

RUBEN GONZALEZ, or MEXICO, MEXICO.

EXTENSIBLE PULLEY.

Application filed December 23, 1922. Serial No. 608,633.

To all whom it may concern) Be it known that I, RUmiN GONZALEZ, a citizen of the United Mexican States residat Mexico city, Federal District, Mexico, have invented certain new and useful Improvements in Extensible Pulleys, of which the following is a specification.

This invention relates to an extensible pulley especially used in cigarette making machines for the conveying belt which car ries the strip of paper loaded with tobacco.

Such pulleys arecovered with a non-skid ribbon which after use becomes flattened whereby the periphery of the pulley is somewhat reduced, so that one of the two simultaneously cut cigarettes becomes a little shorter and the brand or trade-mark printed on the paper strip with little by little come more and more toward the end of the cigarette.

Sectional extensible pulleys have also been.

used, but the non-skid ribbon is rapidly worn out at the several openings between the sections. Other pulleys are formed by a crown through the periphery of which extensor sections pierce, so as to tighten the ribbon by enlarging the diameter.

The object o1 my invention is to facilitate a device which will both allow the tightening of the ribbon and augment the periphery of the pulley but in two independent operations.

In the drawings:

Fig. 1 is a plan view of the pulley;

Fig. 2 a section on line A-B;

Fig. 3 a plan view of one half of the pulley; and

Fig. 4- a section on line C-D.

The pulley comprises a support disk (1) with hub (2), the inner extension 3) of which is threaded at (4) to engage with an expulsing nut pinion (5) having a conical exterior.

On the inner surface of the disk (1) are attached the guide housings (6) for the extensors (7) provided with heads (8) on one end, while the opposite ends (9) are cut to an incline, so as to correspond with the conical portion of the pinion An expansible ring (10) is held between the support disk 1) and the cover disk (11 screws passing through the cover (11) to engage in the holes (13) of the housings (6). Between the housings is mounted a tubular pinion (1.4:) having teeth (15) and a shoulder ('16) for braking. The interior of said pinion has a square bore (17) into which a key may be inserted for expanding" the periphery oi" the ring (10). Both ends of the pinion (let) are supported in the disk (1) and the cover (11). a

On a small support (18) fastened to the inside of the disk 1) is the locking lever (20) pivoted at (19); one end being provided with the bifurcation which when pressed upon the shoulder (16) when the opposite end of the lever is raised by the pressure s'rew (21), piercing through the disk (1), locks the pinion.

The expansible ring (10) carries two stirrups (22) into which are inserted the stop pins (23) fastened to the disk (1) so as t stop the ring from turning.

In order to tighten the non-skid rib on 2 L) indepcndentlv of the expansion of said (10), the ring is provided with the stationary "fastener comprising the support 25 the lever (26) and the pressure screw 27 is grasped by the stationary fastener. while the other end is caught by an adjustable fastener and tightener, comprising the bridge (28) pivoted at (29) to a support (30) on the ring (10), and on the same bridge (28) is a support (31) with the pivot (32), so that the bridge (33) may balance and clamp the ribbon against the bridge piece (28) when the screw is operated.

Now in order to tighten the ribbon over the ring (10), the screw (35) passing through an ample groove in the bridge piece (33) cooperates with the nut-block (36) provided with trunnions (37) and the bridge (28) will oscillate on the pivot (29) when being separated from the interior of the ring (10).

In other systems having a ring formed by sectors the ribbon is tightened by expanding the ring. but in my system there is a decided double action consisting in expanding the ring by means of the extensors and leaving but one opening between the two ends adjoinin the ring; and then stretchiug the non-skid ribbon over the ring whereby both act ons are entirely independent.

In all other systems the ribbon is stretched due to the expansion of the ring. My device operates as follows:

One end of the ribbon (24) is caught by Qne end of the non-skid ribbon (24) a stationary clamp, and the other end by the adjustable clai'np, hen using the screw the ribbon is tightenel. The pulley is now mounted and fastened on the shaft and by inserting the key (not shown) into the square bore (17 the pinion (14:) may be turned, so that due to the teeth ot the nut-pinien (5) having engagement wit said pinion, the conical part will exert pressure on the extensors (7) in a uni term manner, and the heads (8) will expand the ring to the exact required periphery of the putley. i

Before the diameter of the pulley can be modificth the screw (21) is loosened, otherwise the pinion (lat) could not be turned.

Qnee the adjustment is obtained, the locking screw (21) .is againoperated so as to press the other end of the lever against the shoulder.

Having thus described my invention what I claim is:

1. An expansible pulley comprising an integral huh and supporting disk; n'uide housings mounted on said disk; a cover secured to said housings; an expansible ring between said cover and disk and having; two ends; an extensor in each llOUSlDf adapted to cooperate with said ring; means on said hub coacting with said extensors tor increasing the diameter of said rino" and means on the ends of said ring for stretching a ribbon onthe outsidesurface of the, ring.

2. An expansible pulley comprising a hub and supporting disk; a cover for said hub; a ring mounted between said disk and cover and having two ends; extensors mounted for radial movement on said disk adapted to cooperate with said ring; means on said hub adapted to coact with said extensors to change the diameter of said ring; and means on the ends of said ring comprising clamps for securing a ribbon on the outside of said ring.

3. Anexpansiblepulley comprising a hub and supporting disk guide housings mounted on said disk; a cover secured to said musings; a ring between said cover and disk andhaving two ends; an extensor in each housing adapted to cooperate with said ring; means on said hub adapted to operate the extensors radially to change the diam eter oi the ring; locking means for locking said first-named means in any desired position; and means for securing the ends of a ribbon at the ends of said ring to provide a ribbon on the outside of thering; substantially as described.

In testimony whereof I have affixed my signature.

RUBEN GONZALEZ. 

